Buggy code:
public void deleteAttachment ( String assignmentId , String taskId , String attachmentId ) throws AssignmentAccessException , AssignmentStorageException , UserAccessException { } public void deleteAllAttachments ( String assignmentId ) throws AssignmentAccessException , AssignmentStorageException , UserAccessException { } public void deleteAllAttachments ( String assignmentId , String taskId ) throws AssignmentAccessException , AssignmentStorageException , UserAccessException { } public Assignment save ( Assignment assignment ) throws AssignmentStorageException , UserAccessException { if ( ( ( assignment . getAssignmentName ( ) ) == null ) || ( ( assignment . getIsTemplate ( ) ) == null ) ) { throw new AssignmentStorageException ( AssignmentStorageException . MISSING_MANDATORY_PARAMETER_TEXT_ID , new String [ ] { "assignmentName<seq2seq4repair_space>and<seq2seq4repair_space>isTemplate" } ) ; } if ( ( assignment . getIsTemplate ( ) ) == false ) { if ( ( checkInspectionObjectExists ( assignment ) ) == false ) { throw new AssignmentStorageException ( AssignmentStorageException . INVALID_USER_REF_TEXT_ID , new String [ ] { } ) ; } if ( ( checkUserExists ( assignment ) ) == false ) { throw new AssignmentStorageException ( AssignmentStorageException . INVALID_INSP_OBJECT_REF_TEXT_ID , new String [ ] { } ) ; } if ( ( assignment . getAttachments ( ) ) == null ) { assignment . setAttachments ( new ArrayList < com . insframe . server . model . Attachment > ( ) ) ; } if ( ( gridFsService . checkAttachmentsExist ( assignment . listAttachmentIds ( ) ) ) == false ) { throw new AssignmentStorageException ( AssignmentStorageException . INVALID_ATTACHMENT_REF_TEXT_ID , new String [ ] { } ) ; } } else { if ( ( assignment . getInspectionObject ( ) ) != null ) { throw new AssignmentStorageException ( AssignmentStorageException . INVALID_TEMPLATE_ATTR_TEXT_ID , new String [ ] { "inspectionObject" } ) ; } if ( ( assignment . getUser ( ) ) != null ) { throw new AssignmentStorageException ( AssignmentStorageException . INVALID_TEMPLATE_ATTR_TEXT_ID , new String [ ] { "user" } ) ; } if ( ( assignment . getStartDate ( ) ) != null ) { throw new AssignmentStorageException ( AssignmentStorageException . INVALID_TEMPLATE_ATTR_TEXT_ID , new String [ ] { "startDate" } ) ; } if ( ( assignment . getEndDate ( ) ) != null ) { throw new AssignmentStorageException ( AssignmentStorageException . INVALID_TEMPLATE_ATTR_TEXT_ID , new String [ ] { "endDate" } ) ; } if ( ( assignment . getAttachments ( ) ) != null ) { throw new AssignmentStorageException ( AssignmentStorageException . INVALID_TEMPLATE_ATTR_TEXT_ID , new String [ ] { "attachments" } ) ; } } for ( Task task : assignment . getTasks ( ) ) { if ( ( task . getState ( ) ) == ( Task . STATE_ERROR ) ) { assignment . setHasError ( true ) ; } } if ( ( assignment . getHasError ( ) ) == null ) { assignment . setHasError ( false ) ; } if ( ( assignment . getState ( ) ) == null ) { assignment . setState ( STATE_INITIAL ) ; } else { if ( ( ( assignment . getState ( ) ) < ( Assignment . STATE_INITIAL ) ) || ( ( assignment . getState ( ) ) > ( Assignment . STATE_FINISHED ) ) ) { throw new AssignmentStorageException ( AssignmentStorageException . INVALID_STATE_TEXT_ID , new String [ ] { Integer . toString ( assignment . getState ( ) ) } ) ; } } if ( ( assignment . getVersion ( ) ) == null ) { assignment . setVersion ( 0 ) ; } if ( ( assignment . getTasks ( ) ) == null ) { assignment . setTasks ( new ArrayList < Task > ( ) ) ; } else { for ( Task task : assignment . getTasks ( ) ) { if ( ( task . getId ( ) ) == null ) { task . setId ( ObjectId . get ( ) . toString ( ) ) ; } if ( ( task . getAttachments ( ) ) == null ) { task . setAttachments ( new ArrayList < com . insframe . server . model . Attachment > ( ) ) ; } if ( ( task . getErrorDescription ( ) ) == null ) { task . setErrorDescription ( "" ) ; } if ( ( task . getState ( ) ) == null ) { <START_BUG> task . setState ( STATE_OKAY ) ; <END_BUG> } else { if ( ( ( task . getState ( ) ) < ( Task . STATE_INITIAL ) ) || ( ( task . getState ( ) ) > ( Task . STATE_ERROR ) ) ) { throw new AssignmentStorageException ( AssignmentStorageException . INVALID_STATE_TEXT_ID , new String [ ] { Integer . toString ( task . getState ( ) ) , task . getTaskName ( ) } ) ; } } } } try { return assignmentRepository . save ( assignment ) ; } catch ( DuplicateKeyException e ) { if ( ( assignment . getId ( ) ) == null ) { throw new AssignmentStorageException ( AssignmentStorageException . DUPLICATE_KEY_NAME , new String [ ] { assignment . getAssignmentName ( ) } ) ; } else { throw new AssignmentStorageException ( AssignmentStorageException . DUPLICATE_KEY_NAME_ID , new String [ ] { assignment . getId ( ) , assignment . getAssignmentName ( ) } ) ; } } } public Assignment createAssignment ( Assignment assignment ) throws AssignmentAccessException , AssignmentStorageException , UserAccessException { } public Assignment updateAllAttributesById ( String id , Assignment updateAssignment , boolean overwrite ) throws AssignmentAccessException , AssignmentStorageException , UserAccessException { } private boolean checkValidAssignmentOwner ( Assignment assignment ) { } private boolean checkAssignmentVersion ( Assignment oldAssignment , Assignment updatedAssignment ) { } private boolean checkInspectionObjectExists ( Assignment assignment ) { } private boolean checkUserExists ( Assignment assignment ) throws UserAccessException { } private List < Assignment > filterByLoginUser ( List < Assignment > assignments ) { } private List < Assignment > addAttachmentDetails ( List < Assignment > assignments ) { } private Assignment addAttachmentDetails ( Assignment assignment ) { } }

Fix:
task . setState ( Task . STATE_INITIAL ) ;